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Sudoku puzzles disjoint groups (Su Doku)

My database includes 656 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 4x4 box contains the digits 1 through 16. The cells with the same color must also contain the digits 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

194355 puzzles downloaded.

      2 13 8 11   12     7     14  
          4 16     2       11 12  
  4                 3 8        
        5     6   16 4   7     15
                  3 12       15 1
    5   15                     10
          11           5        
4       14   9   15 1         5  
  5         2 10   11   15       6
        4           10          
1                     3   2    
6 10       5 3                  
14     4   13 8   3     12        
        11 10                 7  
  3 11       7     5 14          
  7     2     14   6 11 10 9      
Showing puzzle number: 520
Puzzletype: Symmetrical Sudoku
Startnumbers: 72
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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